Updated documentation for JWTBearer grant type and also updated JWTBearer grant type to require and check for the "sub" property in the JWT.
Updated tests for JWT brearer grant type to test for the "sub" property.
Fxied formatting.
Formatted php docblocks.
Added doc block for getJWT() in JWTBearerTest.
Fixed casing of null in a few files.
Fixed casing of PHP keywords.
Fixed formatting.
Merge pull request #35 from F21/master

Documentation for JWT Grant Type and checking of "sub" JWT parameter